fix chain certificate order

CAUtilLib/BouncyCastleWrapper.cs

@@ -97,11 +97,11 @@ namespace CAUtilLib
 
         public static bool ValidateCertificateChain(List<X509Certificate> certificates)
         {
-            for (int index = certificates.Count - 1; index > 0; index--)
+            for (int index = 0; index < certificates.Count - 1; index++)
             {
-                var signedCertificate = certificates[index];
-                var sourceCertificate = certificates[index - 1];
-                if (!ValidateCert(signedCertificate, sourceCertificate.GetPublicKey()))
+                var validateCertificate = certificates[index];
+                var sourceCertificate = certificates[index + 1]; 
+                if (!ValidateCert(validateCertificate, sourceCertificate.GetPublicKey()))
                 {
                     return false;
                 }
@@ -116,11 +116,11 @@ namespace CAUtilLib
                 return false;
             }
 
-            for (int index = certChain.Count - 1; index > -1; index--)
+            for (int index = 0; index < certChain.Count; index++)
             {
-                var signedCertificate = cert;
+                var validateCertificate = cert;
                 var sourceCertificate = certChain[index];
-                if (ValidateCert(signedCertificate, sourceCertificate.GetPublicKey()))
+                if (ValidateCert(validateCertificate, sourceCertificate.GetPublicKey()))
                 {
                     return true;
                 }